Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6185297 | Low power dialer | Patrick H. Casselman, Marshall William Pharoah, Neal Rudolph, John R. Zabel | 2001-02-06 |
| 5940500 | Series equipment with DC line hold transfer | — | 1999-08-17 |
| 5610978 | Ring discriminator | — | 1997-03-11 |
| 5543741 | Reset circuit for generating reset pulse over an interval of reduced voltage supply | — | 1996-08-06 |